Interference array meter-wave radar under non-Gaussian noise, steady height measurement method and application
A non-Gaussian noise, meter-wave radar technology, applied in radio wave measurement systems, measurement devices, and re-radiation, etc., can solve the problem of limiting the measurement accuracy and resolution of meter-wave radar, and reducing the low-angle height measurement of meter-wave radar. Robustness, reducing the degree of freedom of altimetry, etc., to achieve the effect of expanding the pitch array aperture, achieving reliable resolution and altimetry, and increasing the degree of freedom of the baseline
Pending Publication Date: 2021-04-30
NANCHANG INST OF TECH
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[0004] According to Barton's multipath signal model, the complex multipath signal can be divided into independent specular reflection signal (Specular Component) and scattering component (Diffuse Component), among which the non-Gaussian (Non-Gaussian) distributed scattering component is difficult to accurately model, In engineering applications, it is often simplified to Gaussian white noise, thus reducing the robustness of the low-angle altimetry of meter wave radar
[0005] On the other hand, array resolution can also be improved by increasing the degree of freedom of the array, but the process is complex and the amount of calculation is high. In order to reduce the amount of calculation, the row-column synthesis technology of converting the area array into a line array will greatly reduce the cost of height measurement. degrees of freedom, thus limiting the measurement accuracy and resolution of meter wave radar
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Embodiment 1
[0161] A simulation experiment is carried out on the interference array and the height measuring method described in the specific implementation manner.
[0162] Among them, set Nz=8, Ny=10, N=20, h=30m, H=3000m, R=100km, ρ 0=-0.97, d=0.5λ, λ=1.2m, θ T , θ s ]=[1.703°, -1.74°], 100 Monte Carlo experiments are done for each data point, SNR is defined as the signal-to-noise ratio of the array element, and the commonly used ε mixed noise model (CGM) is selected to simulate the scattering component of the non-Gaussian distribution and White noise, as described in Ref., has a probability density function of
[0163] f=(1-ε)N c (0,σ 2 I 2NzNy )+εN c (0, (kσ) 2 I 2NzNy ), where N c (0,σ 2 I 2NzNy ) represents the zero-mean normal distribution probability density distribution function (PDF), ε∈(0, 1) is the binomial distribution probability, and the power of ε mixed noise is P n =(1-ε)σ 2 +εk 2 +σ 2 , k=30.
[0164] On the basis of the above, experiment 1-experiment 7 ...
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The invention discloses an interference array meter-wave radar under non-Gaussian noise and a steady height measurement method and application. the height measurement method is based on a covariant matrix of a fractional low-order moment of an interference array, and employs the co-variant matrix to inhibit a non-Gaussian distribution scattering component in a complex multipath reflection signal of a low-angle target. Due to the fact that the co-variant matrix reserves the manifold structure of the interference array, decoherence of target direct waves and specular reflection waves can be achieved through the co-variant matrix and the space smoothing technology, and then steady low-angle target height measurement is achieved through the double-scale unitary ESPRIT algorithm. The pitch aperture of the radar is expanded through the interference array structure, the degree of freedom of a baseline is increased, meanwhile, non-Gaussian scattering components in complex multipath signals are suppressed through fractional low-order moments, and the low-angle measurement performance of the meter-wave radar is improved.
Description
technical field [0001] The invention relates to the technical field of meter wave radar. Background technique [0002] Meter wave radar is an important part of air defense systems such as anti-stealth and anti-radiation missiles. However, meter wave radar has a wide beam width and low positioning accuracy. How to improve its target resolution and positioning accuracy has always been an important research topic for meter wave radar, especially Low elevation target altimetry. [0003] Existing studies have found that when the target is in a low elevation angle area, the wide beam irradiating the target will hit the ground, resulting in strong thermal clutter, or the target will generate complex multipath signals through the ground (sea) surface reflection, which will seriously broaden the single pulse. If the beam width is poor, the single-pulse height measurement will have a large error, or even fail. Based on the above situation, the existing technology mainly studies the ...
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Login to View More IPC IPC(8): G01S7/28G01S7/41G01S13/44
CPCG01S7/28G01S7/411G01S7/414G01S13/44
Inventor 陈根华曾春花莫振威纪金程罗晓萱华有为刘翠祯江群烁
Owner NANCHANG INST OF TECH